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-rw-r--r--src/mailman/model/user.py5
1 files changed, 4 insertions, 1 deletions
diff --git a/src/mailman/model/user.py b/src/mailman/model/user.py
index 576015dbe..ffd52fdfb 100644
--- a/src/mailman/model/user.py
+++ b/src/mailman/model/user.py
@@ -66,7 +66,10 @@ class User(Model):
_preferred_address_id = Column(
Integer,
- ForeignKey('address.id', use_alter=True, name='_preferred_address'))
+ ForeignKey('address.id', use_alter=True,
+ name='_preferred_address',
+ ondelete="SET NULL"))
+
_preferred_address = relationship(
'Address', primaryjoin=(_preferred_address_id==Address.id),
post_update=True)